* The ability to sell app subscriptions through iTunes. * 70 percent of the revenue from each sale. * The ability to offer an opt-in form for subscribers that would ask them for a limited amount of information: Name, mailing address, email address.

Hence the recent move by publishers to cozy up to Google and its Android operating system, which will be running on a slew of new tablets in 2011.

The issue, as Kafka points out, is that publishers don’t want to be cut out of customer information and subscription sales that could be equally as valuable when applied to print. iPad-only projects like News Corp’s The Daily won’t have such hang ups.